Open-end spinning device for an open-end spinning machine and open-end spinning machine

ABSTRACT

An open-end spinning device for an open-end spinning machine includes a rotor housing and a spinning rotor having a rotor cup accommodated in the rotor housing. A drive for the spinning rotor is arranged in a drive housing. At least one receptacle for a cover element that closes the rotor housing during spinning operations is provided. The rotor housing includes an adjustable stop for the cover element, the stop positioning the cover element in an axial direction of the spinning rotor.

FIELD OF THE INVENTION

The present invention relates to an open-end spinning device for an open-end spinning machine with a drivable spinning rotor, the rotor cup of which is accommodated in a rotor housing, with a drive for the spinning rotor, which is arranged in a drive housing, and with at least one receptacle for a cover element that closes the rotor housing during the spinning operation. The rotor housing includes a stop for the cover element for positioning the cover element in an axial direction of the spinning rotor. Moreover, the invention relates to an open-end spinning machine with a plurality of adjacently arranged workstations, each of which has an open-end spinning device of this type.

BACKGROUND

Various designs for mounting the open-end spinning devices at a machine frame of the open-end spinning machine have become known.

With respect to open-end rotor spinning machines, it is always necessary to correctly position the thread take-off nozzle with respect to the spinning rotor in the closed condition of the rotor housing. This relates to the positioning of the thread take-off nozzle in an axial direction of the spinning rotor and also to the positioning in a radial direction and to the centering of the thread take-off nozzle and the rotor with respect to each other. It has become known to allow the cover element, which supports the thread take-off nozzle, to impact the rotor housing via an annular seal and, as a result, position the cover element with respect to the rotor housing.

It is also known from DE 10 2006 019 224 A1 to arrange a stop at a bearing receptacle in the case of a spinning rotor mounted on support disks. In the closed condition of the rotor housing, the cover element rests against the stop. As a result, only a few components are arranged between the spinning rotor and the thread take-off nozzle, which, due to their tolerances, influence their position.

Moreover, DE 10 2016 003 148 A1 describes an open-end spinning device that includes a spinning rotor, which is drivable by means of a single motor. A centering device is provided, which ensures, upon the closing of the cover element, that the components of the open-end spinning device are always accurately positioned with respect to one another. Moreover, an axial stop is provided for a channel plate adapter arranged in the cover element, the axial stop being formed in the shape of an annular wall of an annular groove. As a result, the channel plate adapter, which supports the take-off nozzle, is axially positioned with respect to the spinning rotor.

SUMMARY OF THE INVENTION

A problem addressed by the present invention is that of providing an open-end spinning device having an improved axial positioning of the components of the spinning device with respect to one another. Moreover, an appropriate open-end spinning machine is to be provided. Additional objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.

The problems are solved with the aid of the invention as described and claimed herein.

An open-end spinning device for an open-end spinning machine has a drivable spinning rotor, the rotor cup of which is accommodated in a rotor housing, a drive for the spinning rotor, which is arranged in a drive housing, and at least one receptacle for a cover element that closes the rotor housing during the spinning operation. The rotor housing includes a stop for the cover element for positioning the cover element in an axial direction of the spinning rotor.

It is provided that the stop is designed to be adjustable.

Moreover, an open-end spinning machine with a plurality of adjacently arranged workstations is provided, each of the workstations having an open-end spinning device of this type.

Due to the stop, the take-off nozzle, which is accommodated in the cover element, and the rotor cup of the spinning rotor are automatically correctly positioned with respect to each other upon the closing of the cover element. In particular, as a result, the take-off nozzle can be correctly aligned with respect to the rotor groove upon the closing of the cover element, which is of considerable significance for the quality of the spun yarn. Due to the fact that the stop is now designed to be adjustable, it is possible with respect to spinning technology to always set the correct position of the take-off nozzle with respect to the rotor cup, in particular the rotor groove. As a result, slightly different axial positionings of the take-off nozzle can be set, for example, depending on the application. It is also possible to compensate for tolerances of the components, which influence the position of the take-off nozzle and the spinning rotor with respect to each other. These types of tolerances can arise despite a precise production of the components. Moreover, a wear-related change in the position of the cover element and, thereby, the take-off nozzle with respect to the spinning rotor can be compensated for.

It is also advantageous when the stop is designed as an adjusting screw. As a result, the adjustment can be carried out very easily, conveniently, and precisely. As a result, smaller deviations from the ideal position of the axial position of the thread take-off nozzle with respect to the spinning rotor can also be compensated for. It is also conceivable to design the stop as two pieces including a threaded part, which is displaceably arranged in the rotor housing, and including a stop, which is insertable into the threaded part or insertable onto the threaded part.

Instead of an adjusting screw, an axially movable and fixable stop would also be possible. For example, a spring-loaded pin could be clamped laterally, i.e., at the circumferential surface of the pin, and, as a result, determine the axial position of the cover element.

It is particularly advantageous when the adjusting screw is arranged so as to be axially parallel to an axis of the spinning rotor. As a result, the adjusting screw can be arranged in a space-saving manner. In order to achieve a finer adjustment of the stop, it is also conceivable in principle, however, to arrange the adjusting screw at an angle relative to the spinning rotor.

It is advantageous when the stop, in particular the adjusting screw, is adjustable from a front side of the rotor housing facing the cover element. The stop is therefore accessible at any time after the rotor housing has been opened or the cover element has been moved into a maintenance position, even after the initial installation of the open-end spinning device.

It is also advantageous when the adjusting screw has an adjusting head, preferably a special head, particularly preferably a star-shaped special head. The adjusting head forms the stop for the cover element in this case. If the adjusting screw has a special head, such as, for example, a star-shaped adjusting head, a trihedron, or the like, the adjusting screw can be secured against unauthorized displacement. If the adjusting screw is adjustable from behind, i.e., from the back side of the rotor housing facing away from the cover element, or from the side, an adjusting head does not necessarily need to be provided, of course. The adjusting screw also does not necessarily need to have a head.

Alternatively or additionally, it is advantageous when the adjusting screw is adjustable from a back side of the rotor housing facing away from the cover element. This adjustment possibility is no longer accessible once the open-end spinning device has been installed in the machine. An unauthorized displacement of the stop or of the adjusting screw can also be prevented as a result. In addition, this embodiment offers the possibility of a fast initial adjustment after the assembly of the open-end spinning device, before the open-end spinning device has been installed into the machine. It is therefore also particularly advantageous when the adjusting screw is adjustable from a front side of the rotor housing facing the cover element and also from the back side of the rotor housing facing away from the cover element. The open-end spinning device therefore offers an adjustment possibility for the initial installation from the back side of the rotor housing and also an adjustment possibility from the front side, which is accessible even during the operation of the open-end spinning device.

It is also advantageous when the rotor housing and/or the drive housing have/has an adjusting channel for adjusting the adjusting screw from the back side of the rotor housing. As a result, the adjusting screw can be designed to be short and is nevertheless accessible through the adjusting channel.

It is also advantageous when the adjusting screw has a polygonal socket, in particular a hexagon socket, at its end facing away from the adjusting head. This enables the fast adjustment of the stop without a special tool.

According to another advantageous embodiment, the adjusting screw is secured in the rotor housing by means of a retaining element, in particular an O-ring, in particular being clamped against the rotor housing. An unintentional displacement of the adjusting screw during operation can be prevented as a result. Alternatively, a retention by means of a lock nut, an adhesive securement, or a thrust washer would also be conceivable.

Moreover, it is advantageous when the at least one receptacle for the cover element defines a swivel axis and the cover element is accommodated in the receptacles of the rotor housing so as to be swivelable about the swivel axis. A swivelable design of the cover element makes it possible, in a particularly advantageous way, to bring the cover element out of an operating position, in which the cover element closes the rotor housing, into a maintenance position, in which the cover element permits access to the rotor housing.

It is also advantageous when the stop is arranged in an area of the rotor housing facing away from the at least one receptacle for the cover element, in particular at an end area of the rotor housing situated opposite the at least one receptacle. As a result, the stop is located at a greater vertical distance from the swivel axis of the cover element, as the result of which the adjustment is facilitated.

It is also advantageous when the stop has a smallest possible horizontal distance from a rotation axis of the spinning rotor or is arranged directly in a vertical axis of symmetry of the spinning rotor, which also includes the rotation axis of the spinning rotor. This also contributes to an adjustment that is as precise as possible.

It is also advantageous when the spinning rotor is drivable by means of an individual drive arranged in the drive housing. This makes it possible to operate the open-end spinning device independently of other open-end spinning devices and, if necessary, provide further individual drives at the spinning stations, in order to design the spinning stations to be autonomous.

It is advantageous when the rotor housing is directly connected to the drive housing. For example, the rotor housing can be bolted directly to the drive housing. Here, the correct alignment of the drive with respect to the axis of the spinning rotor can also be achieved without adjustment operations.

According to another advantageous embodiment, the rotor housing is formed as one piece with the drive housing. As a result, additional mounting operations for mounting the drive housing at the rotor housing can be dispensed with. In addition, as a result, the correct alignment of the drive with respect to the axis of the spinning rotor can also be ensured. This is advantageous, in particular, when further functions, such as, for example, a bearing point of a magnetic bearing, are integrated into the drive housing and/or the rotor housing, because these functions are then also aligned exactly with respect to the spinning rotor without adjustment operations.

Additionally or alternatively, it is advantageous when the at least one receptacle for the cover element is formed as one piece with the rotor housing. As a result, the accuracy of the positioning of the fiber feed channel arranged in the cover element and of the take-off nozzle with respect to the spinning rotor is considerably improved. Due to the one-piece design, the machining of the rotor housing, in particular, the formation of stop surfaces and fastening points or bores, can be carried out in a single clamping setup. As a result, an absolutely precise position of the components mounted at the rotor housing, in particular of the cover element, with respect to the spinning rotor can always be ensured. This not only simplifies the installation of the open-end spinning device, but is also particularly advantageous with respect to spinning technology and positively affects the yarn quality.

It is particularly advantageous when the rotor housing is formed as a cast part, wherein the drive housing and/or the receptacles for the cover element are integrally cast onto the rotor housing. The rotor housing can be particularly cost-effectively manufactured as a central support element as a result. In particular, it is advantageous when the rotor housing is formed as a diecast part. This enables the manufacture of the rotor housing with great precision. Provided this is necessary, the metal-cutting final machining can be carried out in a single clamping setup, as described above.

It is also advantageous when the rotor housing has multiple, in particular two, receptacles for the cover element. The positioning of the cover element and of the components arranged thereon, such as the fiber feed channel and the take-off nozzle, with respect to the spinning rotor are further improved as a result. An embodiment having only one single receptacle, which is then preferably designed to be wider, is also conceivable, however. The following comments and the description of the figures therefore also expressly relate to a rotor housing with only one receptacle.

It is also advantageous when the rotor housing has fastening devices integrally formed thereon, in particular spacer bushes integrally formed thereon, for mounting at the machine frame. This also facilitates the mounting of the rotor housing at the machine frame and ensures that the open-end spinning device is correctly positioned with respect to the machine transverse direction.

It is also advantageous when the cover element includes an opening roller housing, which is preferably integrally formed on the cover element. The opening roller housing and, thereby, the opening roller, are also automatically correctly positioned with respect to the spinning device and the rotor housing as a result. It is therefore also particularly advantageous when the opening roller housing is formed as one piece with the cover element.

In order to be able to cost-effectively manufacture the cover element with the opening roller housing, it is also advantageous here when the cover element is formed as a cast part, wherein the opening roller housing is integrally cast onto the cover element.

According to another enhanced embodiment, it is advantageous when the rotor housing has at least one positioning device for positioning the cover element in an axial direction of the swivel axis. As a result, the cover element is automatically brought into the correct lateral position with respect to the swing axis upon closing and is fixed in this correct position when the cover element is closed.

It is advantageous when the positioning device is cast directly onto the rotor housing. As a result, an additional installation step for the positioning device is not necessary and the correct lateral alignment of the cover element with respect to the spinning rotor is always ensured as a result. Preferably, the positioning device is designed to be bifurcated. As a result, the cover element is correctly positioned in both axial directions of the swing axis.

Moreover, it is advantageous when the positioning device has a plastic coating. The plastic coating can, for example, dampen noises during the closing of the cover element and ensure a gentle closing in the positioning of the cover element.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages of the invention are described with reference to the exemplary embodiments represented in the following, wherein:

FIG. 1 shows an open-end spinning machine in a schematic overview representation,

FIG. 2 shows a workstation of an open-end spinning machine with an open-end spinning device in a schematic, partially cut side view,

FIG. 3 shows an open-end spinning device with a stop for a cover element of the rotor housing in a schematic, cut side view,

FIG. 4 shows an open-end spinning device with a stop for a cover element of the rotor housing in a schematic, cut side view according to an alternative embodiment,

FIG. 5 shows another alternative embodiment of an open-end spinning device with a stop for a cover element of the rotor housing in a schematic, cut side view,

FIG. 6 shows an embodiment of a rotor housing, which is designed as a central support part, in a perspective representation,

FIG. 7 shows an alternative embodiment of a rotor housing, which is designed as a central support part, in a perspective representation, and

FIG. 8 shows a positioning device for the cover element in a schematic top view.

DETAILED DESCRIPTION

Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

In the following description of the exemplary embodiments, features that are identical or at least comparable with respect to their design and/or mode of operation are provided with identical reference signs. Moreover, these features are explained in detail only at their first mention, while only the differences from the previously described exemplary embodiments are discussed in the subsequent exemplary embodiments. Moreover, for the sake of clarity, often only one or only a few of several identical components and/or features is/are labeled.

FIG. 1 shows a schematic front view of an open-end spinning machine 2. The open-end spinning machine 2 has, in a way known per se, a plurality of adjacently arranged workstations 34, which can be arranged between two frames 33 on one or also on both longitudinal sides of the open-end spinning machine 2. Each of the workstations 34 has, also in a known way, an opening roller 9 for opening a supplied fiber material 25 (see FIG. 2 ) into individual fibers and an open-end spinning device 1 for spinning the fiber material 25 into a thread 26. The spun thread 26 is then drawn off by means of a take-off device 27 and wound onto a package 29 by means of a winding device 28. For the purpose of controlling the processes at the open-end spinning machine 2, the spinning machine also has a control unit 35, which can interact with further control units 35 (not shown) arranged at the individual workstations 34.

FIG. 2 shows a detailed representation of a workstation 34 of an open-end spinning machine 2 of this type in a partially cut side view. As described above with reference to FIG. 1 , the fiber material 25 is supplied to the open-end spinning device 1 and opened into individual fibers by means of the opening roller 9 and, from there, supplied to the open-end spinning device 1 through a fiber feed channel (not shown here).

The open-end spinning device includes, in a usual way, a spinning rotor 3, the rotor cup 4 of which revolves in a rotor housing 6 and the rotor shaft 5 of which is rotatably mounted in a drive housing 7. For this purpose, the spinning rotor 3 is driven by means of a drive 8, which is also arranged in the drive housing 7, and is mounted in a bearing assembly 16. The drive can be designed as an individual drive (see FIGS. 5 and 7 ) and also as a central drive that includes a tangential belt 46 (see FIG. 8 ).

The bearing assembly 16 includes a front radial bearing 17 and a rear radial bearing 18. The radial bearings can be designed as magnetic bearings (see FIGS. 5 and 7 ) and also as conventional support disk bearings (see FIG. 8 ). Moreover, the spinning rotor 3 is supported in an axial direction by an axial bearing 19, which can also be designed as a magnetic bearing, but also as an air bearing or any other type of bearing. The rotor housing 6 and the drive housing 7 are fixed at a machine frame 12 of the open-end spinning machine 2.

The rotor housing 6 is subjected to suction during the spinning operation, for the purpose of which the rotor housing 6 is connected to a suction channel 31 via a suction connection 30. During the spinning operation, the rotor housing 6 is closed with a cover element 11, which, in the present case, is fixed in receptacles 10 of the open-end spinning device 1 so as to be swivelable about a swivel axis 20. In order to open the rotor housing 6, the cover element 11 can therefore be swiveled out of the closed position or operating position represented by solid lines into the open position or maintenance position represented by dash-dotted lines. The cover element 11 is provided with an extension 36, which supports a thread take-off nozzle 37 and protrudes into the rotor cup 4 of the spinning rotor 3 during the spinning operation. The newly spun thread 26 is drawn off via the thread take-off nozzle 37. The extension 36 can also be designed as a channel plate adapter exchangeably arranged in the cover element 11, as shown in FIG. 5 . In the present case, the cover element 11 simultaneously supports the opening roller 9, so that the cover element 11 is formed as one piece with an opening roller housing 21.

FIG. 3 shows an open-end spinning device 1 in a schematic, cut side view. The rotor housing 6 in this embodiment also includes, in addition to the housing for the spinning rotor 3, the drive housing 7 and the receptacles 10 for the cover element 11. The receptacles 10 include, in the present case, bores, in which the cover element 11 is swivelably mounted and which, therefore, form a swivel axis 20 for the cover element 11. According to this embodiment, the cover element 11 also includes the opening roller housing 21 integrally formed onto the cover element 11 and is swivelably mounted at the receptacles 10 of the rotor housing 6, for example, by means of tabs 38. The opening roller housing 21 can also be designed as a separate component, however, and can be connected to the cover element 11. The extension 36 of the cover element 11 is also apparent. The extension 36 of the cover element 11 is designed in the present case as a channel plate adapter, which is insertable into the cover element 11.

According to the present representation, the spinning rotor 3 is shown in its operating position accommodated in the rotor housing 6. The rotor cup 4 is located within the rotor housing 6, while the rotor shaft 5 is located within the drive housing 7 adjacent to the rotor housing 6.

Moreover, the front radial bearing 17 of the bearing assembly 16 is also apparent in the present representation, the bearing assembly 16 being designed as a magnetic bearing assembly. The drive housing 7 and, thereby, the rotor housing 6 connected to the drive housing 7 include the front bearing point 15 for the front radial bearing 17. Fastening bores 32 are provided in the drive housing 7 for this purpose, the fastening bores 32 enabling a mounting of the front radial bearing 17. According to the present representation, the drive housing 7 also includes fastening bores 32, which enable a mounting of the drive 8, which is designed as an individual drive in the present case. The rear radial bearing 18 (not visible here) can be mounted, for example, in a cover element 11, which is insertable into the drive housing 7. Alternatively, it would also be possible, however, to also mount the rear radial bearing 18 directly in the drive housing 7. In deviation from the representation shown, it would also be possible to provide a central drive, rather than an individual drive, for the spinning rotor 3. Similarly, instead of the magnetic bearing assembly, a support disk bearing arrangement or a direct bearing arrangement could also be provided.

The three components, rotor housing 6, drive housing 7, and receptacles 10, are formed as one piece with one another. Therefore, these can be advantageously designed as a highly compact cast part, which combines the aforementioned functions in one component and also enables the integration of numerous further functions and components of the open-end spinning device 1. According to an alternative embodiment, the rotor housing 6 and the drive housing 7 could also be designed as separate components, however. The same applies for the receptacles 7. It is particularly advantageous, however, with respect to the one-piece design, that all functional and contact surfaces and fastening devices, such as bores and the like, can be formed in one single clamping setup of the rotor housing 6. In other words, the rotor housing 6 needs to be clamped only one time for the machining. All metal-cutting machining steps can then be carried out on the rotor housing 6 without re-clamping the rotor housing 6. As a result, an extremely accurate position of the opening roller housing 21 and of the cover element 11 with respect to the rotor housing 6 can already be ensured. The rotor housing 6 can be produced highly cost-effectively despite the precise manufacture due to the design as a cast part and the machining in only one single clamping setup. Due to the precise design, the cover element 11 with the extension 36 and the thread take-off nozzle 37 can already be positioned highly precisely with respect to the spinning rotor. Complicated adjustment operations at the open-end spinning device 1 can be dispensed with due to the one-piece design of the rotor housing 6 with the drive housing 7 and the receptacles 10.

A stop 22 is also provided in order to also assist the exact positioning of the cover element 11 with respect to the rotor housing 6. By means of this stop 22, the cover element 11 and, thereby, the thread take-off nozzle 37, can be correctly positioned with respect to the axial direction of the spinning rotor 3 and with respect to the rotor groove during closing and in the closed position of the cover element 11. The position of the thread take-off nozzle 37 with respect to the rotor groove can influence the properties of the spun thread 26 and, for this reason, should be set as exactly as possible. As a result, considerable spinning technology-related advantages are achieved and a high-quality yarn can be produced.

The stop 22 is designed in the present case as an adjusting screw 42, which is arranged so as to be axially parallel to the axis of the spinning rotor 3. The actual stop 22 is formed by an adjusting head 43 of the adjusting screw 42, which simultaneously also enables the convenient adjustment of the adjusting screw 42. Preferably, the stop 22 or the adjusting screw 42 is arranged centrally with respect to the open-end spinning device 1 over the axis of the spinning rotor 3, as is apparent, for example, from FIGS. 6 and 7 .

It is also advantageous when the stop 22 is arranged in an area of the rotor housing 6 facing away from the receptacles 10 for the cover element 11, as shown in the present case. For example, in the present case, the stop 22 is arranged in an end area 39 of the rotor housing 6 situated opposite the receptacles 10. As a result, the stop 22 or the adjusting screw has a great vertical distance to the swivel axis 20, which facilitates the adjustment of the stop 22. By means of such an adjustable stop 22, the distance between the thread take-off nozzle 37 and the spinning rotor 3 can be set in various ways and, for example, adapted to spinning technology-related conditions in a certain application.

The stop 22 or the adjusting screw 42 is adjustable in the present case from a front side of the rotor housing facing the cover element. This makes it possible to fix the position of the cover element 11 with respect to the rotor housing 6 one time after the initial installation of the cover element 11 and, as a result, take possible tolerances into account, which tolerances can arise due to the installation of the bearing assembly 16 and the accommodation of the spinning rotor 3. This arrangement also makes it possible to carry out another fine adjustment or re-adjustment of the stop 22, or to make an adaptation to various applications, even after the start-up of the open-end spinning device 1.

In order to prevent the unintentional displacement of the stop 22, specifically the adjusting screw in this case, during operation, the adjusting screw can also be clamped against the rotor housing 6 with an O-ring 40 as shown here or secured by means of another screw locking device.

It can also be provided that the stop 22 is not to be displaced again after the initial adjustment of the stop 22. If the stop 22 is designed as an adjusting screw 42, the adjusting screw 42 can also be secured against unauthorized displacement, for example. Screws that include a special head that is star-shaped or has any other shape, for example, are also conceivable in this case.

The possibility for adjusting the axial position of the cover element 11 shown here has the advantage that the adjusting screw 42 is also accessible after the open-end spinning device 1 has been installed into the open-end spinning machine 2. In order to adjust the stop 22, the rotor housing 6 must be opened and the cover element 11 brought into its maintenance position, although the cover element 11 must be closed again in order to check the axial position of the spinning rotor 3. As a result, the adjustment and checking process may need to be repeated several times.

In order to avoid repeatedly opening and closing the rotor housing 6 during the adjustment, it would also be conceivable, however, according to an alternative embodiment (not shown here) to carry out the adjustment of the axial position of the cover element 11 directly during the measurement of the axial position of the spinning rotor 3 with the rotor housing 6 closed. For this purpose, the cover element 11 could be provided with a passage opening for an adjustment tool. If the stop 22 is located outside the seal of the rotor housing 6, as shown in FIG. 3 , the passage opening does not also need to be sealed off separately. Similarly, an actuating mechanism that is displaceable from the outside, which could be designed, for example, in the manner of a spindle drive that includes a spindle nut that is actuatable from the outside, could be arranged in the rotor housing. Other displacement mechanisms that are actuatable from the outside are also conceivable, of course. For example, instead of an adjusting screw, a spring-loaded pin could also be provided. Once the clamping has been released, the spring-loaded pin would be initially pressed by the spring force entirely “outward,” i.e., in the direction of the cover element and, with the cover element closed, could then be pressed back in the direction of the rotor housing while a measurement is underway. If the desired position has been reached, the pin could be clamped due to a lateral clamping at its circumferential surface and, as a result, fixed in position.

FIG. 4 , by contrast, shows another embodiment of an open-end spinning device, in which, in addition to the above-described adjustment possibility by means of the adjusting head 43 of the adjusting screw 42, it is also possible to adjust the stop 22 from a back side of the rotor housing 6 facing away from the cover element 11. In the present example, the adjusting screw 42 includes, for this purpose, a polygonal socket 44 at the end of the adjusting screw 42 facing away from the adjusting head 43. In the present case, the polygonal socket 44 is designed as a hexagon socket. The hexagon socket can be easily introduced into the back end of the adjusting screw 42 and, as a result, requires no additional space. In order to enable access to the back end of the adjusting screw 42, which is located in the area of the front side of the rotor housing 6 facing the cover element 11, the rotor housing 6 includes an adjusting channel 45, the rotor housing 6 being designed as one piece with the drive housing 7 in this case. The adjusting channel 45 extends from the adjusting screw 42 up to the back end of the rotor housing 6 facing away from the cover element 11 and up to the back end of the drive housing 7 integrally formed on the rotor housing 6, and enables the introduction of an adjusting tool. Therefore, the adjusting screw 42 can be adjusted from the back side of the rotor housing 6.

Once the open-end spinning device 1 has been installed into the open-end spinning machine 2, the adjusting channel 45 and the back end of the adjusting screw 42 are no longer accessible. This adjustment possibility is therefore advantageous for carrying out a fast initial adjustment of the axial position of the cover element 11 in the pre-assembly of the open-end spinning device 1. It is advantageous that this can take place in one single step with the open-end spinning device 1 closed and with the cover element in the operating position.

It is conceivable, in principle, to also provide only one adjustment possibility from the back side of the rotor housing 6 facing away from the cover element 11. This enables an adjustment of the axial position of the cover element 11 ex works. In this case, a readjustment possibility is not provided, or, for this purpose, the open-end spinning device 1 would first have to be removed from the open-end spinning machine 2. It is therefore particularly advantageous when an adjustment is possible from the front side and from the back side, as shown here.

For the rest, the embodiment of the open-end spinning device 2 corresponds to that from FIG. 3 and is therefore not explained in greater detail again. The modifications mentioned with reference to FIG. 3 are also possible in this embodiment.

FIG. 5 shows another embodiment of an open-end spinning device 1, in which, as described with reference to FIG. 4 , an adjustment is possible from the front side and from the back side of the rotor housing 6 and of the drive housing 7. In this case as well, it would also be possible, however, in deviation from the representation shown, to provide the adjustment possibility only from the back side of the rotor housing 6 facing away from the cover element 11. The adjusting screw 42 and the configuration of the rotor housing 6 and of the drive housing 7 with the adjusting channel 45 correspond, in this regard, to those from FIG. 4 and are therefore not explained in greater detail.

In contrast to FIG. 4 , the rotor housing 6 and the drive housing 7 are designed as separate components in this case. In fact, influences on the position of the cover element 11 can arise in this embodiment due to tolerances of the two components. This has no disadvantages, however, due to the possibility of adjusting the axial position of the cover element 11 and of the thread take-off nozzle 37 by means of the stop 22. Moreover, in deviation from FIGS. 3 and 4 , the bearing assembly 16 is designed as a support disk bearing arrangement in this case and the drive 8 is designed as a central drive that includes a tangential belt 46.

For the rest, the embodiment of the open-end spinning device 2 corresponds to that from FIG. 4 and is therefore not explained in greater detail again. The modifications mentioned with reference to FIGS. 3 and 4 are also possible in this embodiment.

The adjustable stop 22 can also be advantageously used in this type of open-end spinning device 1.

With respect to the embodiments from FIGS. 3 through 5 , it is advantageous, in principle, when the stop 22 has a horizontal distance to a rotation axis (not indicated) of the spinning rotor 3 that is as small as possible, as is also apparent in FIGS. 6 and 7 . The term “horizontal” refers to a width direction of the open-end spinning device 1 and of the rotor housing 6, in which the swivel axis 20 also extends. This also contributes to an adjustment that is as precise as possible. In the embodiments shown, the stop 22 is therefore arranged directly in the vertical axis of symmetry of the spinning rotor 3, which extends through the rotation axis of the spinning rotor 3.

FIG. 6 also shows an embodiment of a rotor housing 6, which is designed as a central support part, which can be fixed by means of fastening devices, such as, for example, fastening bores 32, at a machine frame 12 (see FIG. 2 ) and at which further components of the open-end spinning device 2 can be arranged. The rotor housing 6 also includes, in addition to the housing for the spinning rotor 3 (see FIG. 2 ), the drive housing 7 and the receptacles 10 for the cover element 11. The receptacles 10 include, in the present case, bores, in which the cover element 11 is swivelably mounted and which, therefore, form a swivel axis 20 for the cover element 11. The stop 22 and, in particular, the central position of the stop 22 with respect to an axis of the spinning rotor 3 are readily apparent here. Moreover, the suction connection 30 is also visible.

FIG. 7 shows another embodiment of a rotor housing 6 of this type. In contrast to the rotor housing 6 from FIG. 6 , the present rotor housing 6 has a cast-on, peripheral frame 14, which includes the receptacles 10 for the opening roller housing 21 and the cover element 11. The two receptacles 10 are connected by a cross brace. The frame 14 is therefore formed by the two receptacles 10 and, in the present case, a cross brace. As a result, the rotor housing 6 has a particularly high rigidity, which further supports the exact positioning of the cover element 11 with respect to the rotor housing 6 with the spinning rotor 3.

In the rotor housing 6 from FIG. 4 , spacer bushes 13, as fastening devices, are cast directly onto the rotor housing 6. The spacer bushes 13 enable bolting directly onto a vertical wall of the machine frame 12 (see FIG. 2 ). The mounting of the rotor housing 6 at the open-end spinning device 1 is facilitated as a result. Of course, such spacer bushes 13 can also be cast on in the case of the rotor housing 6 from FIG. 3 , in order to correctly position the rotor housing 6 at the machine frame 12.

A positioning device 23 is also apparent at the rotor housing 6 shown in the present case. By means of the positioning device 23, the cover element 11 can be positioned, during closing, in a correct position with respect to a direction transverse to the axis of the spinning rotor 3, i.e., in a width direction of the rotor housing 6 in the present case. In other words, by means of the positioning device 23, the cover element 11 is correctly positioned in an axial direction of the swivel axis 20 with respect to the rotor housing 6 and, thereby, the spinning rotor 3. The positioning device 23 can include only one positioning element 41 as shown in the present case. The positioning element 41 can be wrapped around, for example, by a bifurcated counterpart (not shown) at the cover element 11, as the result of which the cover element 11 is unambiguously positioned.

Alternatively, it would also be conceivable to arrange a second positioning element 41 or a second positioning device 23 spaced apart from the positioning device 23 shown, in order to securely position the cover element 11 in both axial directions of the swivel axis 20. The positioning device 23 is also advantageously cast directly onto the rotor housing 6, as the result of which the correct positioning of the cover element 11 is always ensured without any adjustment effort. Similarly, due to the cast-on positioning device 23, the effort required to install the rotor housing 6 and the open-end spinning device 1 is further reduced.

FIG. 8 also shows another embodiment of a positioning device 23 in a schematic top view. In contrast to the positioning device 23 from FIG. 7 , the present positioning device 23 includes two positioning elements 41 situated opposite each other. In the present case, the positioning device 23 is therefore designed to be bifurcated. As the cover element 11 is closed, a corresponding counterpart (not shown) arranged at the cover element 11 enters the space between the two positioning elements 41 as indicated by the arrow, as the result of which the cover element 11 in turn is positioned exactly in both axial directions of the swivel axis 20 (see FIGS. 6 and 7 ). The positioning device 23 shown in the present case also has a plastic coating 24, which is applied on each of the positioning elements 41. The positioning of the thread take-off nozzle 37 with respect to the rotor cup 4 of the spinning rotor 3 is further improved as a result.

The present invention is not limited to the represented and described exemplary embodiments. Modifications within the scope of the claims are also possible, as is any combination of the described features, even if they are represented and described in different parts of the description or the claims or in different exemplary embodiments, provided no contradiction to the teaching of the independent claims results.

List of reference signs

1 open-end spinning device

2 open-end spinning machine

3 spinning rotor

4 rotor cup

5 rotor shaft

6 rotor housing

7 drive housing

8 drive

9 opening roller

10 receptacle

11 cover element

12 machine frame

13 spacer bush

14 frame

15 bearing point

16 bearing assembly

17 front radial bearing

18 rear radial bearing

19 axial bearing

20 swivel axis

21 opening roller housing

22 stop

23 positioning device

24 plastic coating

25 fiber material

26 thread

27 take-off device

28 winding device

29 package

30 suction connection

31 suction channel

32 fastening bore

33 frame

34 workstation

35 control unit

36 extension

37 thread draw-off nozzle

38 tab

39 end area

40 O-ring

41 positioning element

42 adjusting screw

43 adjusting head

44 polygonal socket

45 adjusting channel

46 tangential belt 

1-15. canceled.
 16. An open-end spinning device for an open-end spinning machine, comprising: a rotor housing; a drivable spinning rotor having a rotor cup accommodated in the rotor housing; a drive for the spinning rotor arranged in a drive housing; at least one receptacle for a cover element that closes the rotor housing during spinning operations; the rotor housing comprising a stop for the cover element, the stop positioning the cover element in an axial direction of the spinning rotor; and wherein the stop is adjustable.
 17. The open-end spinning device of claim 16, wherein the stop comprises an adjusting screw that is axially parallel to an axis of the spinning rotor.
 18. The open-end spinning device of claim 17, wherein the stop is adjustable from a front side of the rotor housing facing the cover element.
 19. The open-end spinning device of claim 17, wherein the adjusting screw is adjustable from a back side of the rotor housing facing away from the cover element.
 20. The open-end spinning device of claim 19, wherein one of the rotor housing or the drive housing comprises an adjusting channel for adjustment of the adjusting screw from the back side of the rotor housing.
 21. The open-end spinning device of claim 17, wherein the adjusting screw comprises an adjusting head.
 22. The open-end spinning device of claim 21, wherein the adjusting screw comprises a polygonal socket at an end facing away from the adjusting head.
 23. The open-end spinning device of claim 17, further comprising a retaining element that secures the adjusting screw in the rotor housing.
 24. The open-end spinning device of claim 16, wherein the stop is arranged in an end area of the rotor housing situated opposite the at least one receptacle.
 25. The open-end spinning device of claim 16, wherein the drive is an individual drive arranged in the drive housing.
 26. The open-end spinning device of claim 16, wherein the rotor housing is directly connected to the drive housing.
 27. The open-end spinning device of claim 16, wherein the rotor housing is formed as a one piece part with the drive housing and the at least one receptacle for the cover element.
 28. The open-end spinning device of claim 16, wherein the rotor housing comprises a fastening device integrally formed thereon to mount the rotor housing to a machine frame of the open-end spinning machine.
 29. The open-end spinning device of claim 16, wherein the cover element comprises an opening roller housing formed integrally thereon.
 30. An open-end spinning machine, comprising: a plurality of adjacently arranged workstations; and wherein each of the workstations comprises the open-end spinning device of claim
 16. 